A few syndicators I’ve heard of actually buy their investors out add a predetermined level with refinance proceeds or new capital at a lower price.  

Most of the outcomes with the tenants were predetermined by me.

If that time allows you to consume audio books or podcasts that improve your mindset and help you learn how to invest better than your time in your car might be a predetermined study time that could help you improve your real estate investing knowledge and skills (although you could dedicate your work out or exercise time to listening and learning too).Basically, what I am saying is you have to look at more than just the numbers to make the best decision for you.

Then at the end of the term, the seller has the option to buy the property at a pre-determined price.

This eliminates having to find an end buyer within a limited time frame, enable you to hold out for the best price thereby earning a greater deal spread, enable you to expose the property to a much bigger market via MLS, and allow you to offer a fast, fast close while your competition is offering a 60-90 day closing.A modified version of this is to use options, placing money at risk for the right to purchase the property at a predetermined price for a specific length of time.Obviously, actually buying the property before you have a buyer lined up does not allow for an inexpensive exit should you have incorrectly evaluated the property value.  

For example, if the house is supposedly $300k now, the lease option is to purchase the home at a pre-determined price in x years. 

You'll get monthly statements that reflect that and you should be notified (not asked) every time there is a maintenance issue below a certain predetermined threshold.

You are leasing house for predetermined time and you have option to buy it at price you both agree on in this time frame

Does that HELOC remain in place for the predetermined 10 year draw period and 20 year payback?

After year one we pay an pre-determined interest payment to everyone, after years two three and four we pay another pre-determined rate and then after year five we pay all the principal back plus interest.According to my research and in reading @Matt Faircloth's book Raising Private Capital this would not violate SEC regulations because the money is not being invested into a common entity.